camless ic engine
DESCRIPTION
Camless ic engine using solenoid valve and decoderTRANSCRIPT
Diapositive 1MANISH KUCHA (09ME23)
GAUTAM KUNDARIA (09ME24)
BALKRISHN PATEL (09ME31)
DARSHAN PATEL (09ME32)
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INTRODUCTION
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Valve Operating Mechanism
The valve mechanism operations consist of cam, tappet, rocker arm, spring and valves. The cam is the most important member of valve operating mechanism. Cam shape plays major role in operating characteristics of engine. Shape of the lobe determines
When the valves open, and
How long they open .
This determines the amount of valve overlap. The cam controls the amount of air-fuel mixture that suck into the cylinder.
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CAM:
It is device which converts rotary motion of camshaft to the linear motion of valves.
The camshaft is driven by crankshaft by a pair of meshing gears or sprocket connected by chain called as timing chain.
The valve is opened by the positive mechanical action of the cam lobe and it is closed by spring pressure
Since the timing of the engine is dependent on the shape of the cam lobe and the rotational velocity of camshaft.
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Disadvantages
As in motion transmission increases the power loss due to friction increases and hence reduction in output of the engine.
Frequent use of cam lead to change in shape of cam which affects valve timing.
Metal to metal contact lead to noise and thermal losses.
In conventional engine the push rod and rocker arm impose some inertia, which affects valve action .
Cam design is very difficult for max. power and efficiency.
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PROTOTYPE OF CAMLESS IC ENGINE
The solenoid valves is in such a way that valves opens and closes in accordance with piston positions, which lead to soft and gradual landing, opening, closing and overlapping of valves.
Absolute Encoder:
Absolute Encoder
A rotary encoder, also called a shaft encoder, is an electro-mechanical device that converts the angular position or motion of a shaft or axle to an analog or digital code. The output of incremental encoders provides information about the motion of the shaft which is typically further processed in PLC.
The output of absolute encoders indicates the current position of the shaft.
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A solenoid is a coil of low resistance wire.
They work on the principle that a current travelling through a wire generates a magnetic field. If, as in a solenoid, a wire is continually wound tightly together a magnetic field is created.
This field acts perpendicular to the wire coil (along the axis of the solenoid).
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The mechanical construction of a solenoid can be seen in figure.
The force generated by a solenoid is directly proportional to the current being applied to the solenoid and inversely proportional to the square of the distance between the plunger and the solenoid coil.
The magnetic field strength is given by:
B=μ0nI
where B = is the field strength in Tesla
n is the number of turns in the solenoid divided by its length
I is the current flowing through the solenoid.
The force generated is:
Conti..
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ADVANTAGE
Page 910-918
Engine”, Dhanpat Rai Publication ,200,Page 491-496
[3] I.Gould,W. Richeseson and F.Erikson, “Performance of Camless
Engine Using valve Actuator with Programmable Timing ”,
SAE,1991
GAUTAM KUNDARIA (09ME24)
BALKRISHN PATEL (09ME31)
DARSHAN PATEL (09ME32)
Page *
INTRODUCTION
*
Valve Operating Mechanism
The valve mechanism operations consist of cam, tappet, rocker arm, spring and valves. The cam is the most important member of valve operating mechanism. Cam shape plays major role in operating characteristics of engine. Shape of the lobe determines
When the valves open, and
How long they open .
This determines the amount of valve overlap. The cam controls the amount of air-fuel mixture that suck into the cylinder.
Page *
CAM:
It is device which converts rotary motion of camshaft to the linear motion of valves.
The camshaft is driven by crankshaft by a pair of meshing gears or sprocket connected by chain called as timing chain.
The valve is opened by the positive mechanical action of the cam lobe and it is closed by spring pressure
Since the timing of the engine is dependent on the shape of the cam lobe and the rotational velocity of camshaft.
Page *
Disadvantages
As in motion transmission increases the power loss due to friction increases and hence reduction in output of the engine.
Frequent use of cam lead to change in shape of cam which affects valve timing.
Metal to metal contact lead to noise and thermal losses.
In conventional engine the push rod and rocker arm impose some inertia, which affects valve action .
Cam design is very difficult for max. power and efficiency.
Page *
PROTOTYPE OF CAMLESS IC ENGINE
The solenoid valves is in such a way that valves opens and closes in accordance with piston positions, which lead to soft and gradual landing, opening, closing and overlapping of valves.
Absolute Encoder:
Absolute Encoder
A rotary encoder, also called a shaft encoder, is an electro-mechanical device that converts the angular position or motion of a shaft or axle to an analog or digital code. The output of incremental encoders provides information about the motion of the shaft which is typically further processed in PLC.
The output of absolute encoders indicates the current position of the shaft.
Page *
A solenoid is a coil of low resistance wire.
They work on the principle that a current travelling through a wire generates a magnetic field. If, as in a solenoid, a wire is continually wound tightly together a magnetic field is created.
This field acts perpendicular to the wire coil (along the axis of the solenoid).
Page *
The mechanical construction of a solenoid can be seen in figure.
The force generated by a solenoid is directly proportional to the current being applied to the solenoid and inversely proportional to the square of the distance between the plunger and the solenoid coil.
The magnetic field strength is given by:
B=μ0nI
where B = is the field strength in Tesla
n is the number of turns in the solenoid divided by its length
I is the current flowing through the solenoid.
The force generated is:
Conti..
Page *
Page *
Page *
ADVANTAGE
Page 910-918
Engine”, Dhanpat Rai Publication ,200,Page 491-496
[3] I.Gould,W. Richeseson and F.Erikson, “Performance of Camless
Engine Using valve Actuator with Programmable Timing ”,
SAE,1991